Exhaust cut out valve
An exhaust cutout valve is a mechanical device that is installed in the exhaust system of a vehicle. It allows the driver to selectively open or close off the exhaust flow, allowing the engine to produce more power and noise.
The valve is typically controlled by a switch or button inside the vehicle, and can be opened or closed as desired. Exhaust cutout valves are often used in racing and performance driving, as they allow the driver to bypass the muffler and exhaust system for a louder and more aggressive sound.
It also increase horsepower and torque by allowing the exhaust gases to flow more freely.